NEC Xen Topaz System Hardware Manual page 49

Xen Topaz System Hardware Manual
3. Feed DLS cable into the hole.
4. Insert the DLS Connectors on the DLS Cable into "DLCN1" and
"DLCN2" on the PCB in the upper housing.
5. Replace the lower housing and tighten the screws to hold the
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Key Telephone & Console Installations